MAX5026EUT+T

MAX5025–MAX5028

500kHz, 36V Output, SOT23,

Step-Up DC-DC Converters

______________________________________________________________________________________

11

trace lengths to reduce stray capacitance, trace resis-
tance, and radiated noise. The trace between the out-
put voltage-divider (MAX5025/MAX5026) and the FB
pin must be kept short, as well as the trace between
GND and PGND.

Inductor Layout

The shielded drum type inductors have a small air gap
around the top and bottom periphery. The incident fring-
ing magnetic field from this air gap to the copper plane
on the PC board tends to reduce efficiency. This is a
result of the induced eddy currents on the copper plane.
To minimize this effect, avoid laying out any copper
planes under the mounting area of these inductors.

30V Boost Application Circuit

Figures 2 and 3 show the MAX5025/MAX5026 operat-
ing in a 30V boost application. Figure 3 has an RC filter
to reduce noise at the output. These circuits provide
output currents greater than 4mA with an input voltage
of 5V or greater. They are designed by following the
Design Procedure section. Operating characteristics of
these circuits are shown in the 

Typical Operating

Characteristics section.

V

CC

V

OUT

+30V

GND

FB

PGND

C1
4.7

μF

C2
1

μF

LX

L1

47

μH

MAX5025
MAX5026

C2
1

μF

V

CC

 = 4.5V TO 11V

(MAX5025)

V

CC

 = 3V TO 11V

(MAX5026)

D1

R1
147k

Ω

R2
6.34k

Ω

TOKO 47

μH INDUCTOR

A915BY-470M

ZETEX SCHOTTKY DIODE
ZHCS500

SHDN

Figure 2. Adjustable 30V Output Circuit

V

CC

V

OUT

+30V

GND

FB

PGND

C1
4.7

μF

C2
1

μF

LX

L1

47

μH

MAX5025
MAX5026

C3
1

μF

V

CC

 = 4.5V TO 11V

(MAX5025)

V

CC

 = 3V TO 11V

(MAX5026)

D1

R1
147k

Ω

R3

100

Ω

R2
6.34k

Ω

TOKO 47

μH INDUCTOR

A915BY-470M

ZETEX SCHOTTKY DIODE
ZHCS500

SHDN

Figure 3. Adjustable 30V Output Circuit with RC Filter

MAX5026EUT+T Datasheet Related Products:
MAX5026EUT+T Information:
Part No.
MAX5026EUT+T
Description
IC REG BOOST ADJ 40MA SOT23-6
File Size
349501 bytes
Page Size
612 x 792 pts (letter)
All Pages
13
Manufacturer
Maxim Integrated
Homepage
http://www.maximintegrated.com/en.html
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